Agree with other responses - case in point is outdated.
The structures outlined might be useful to read through and get some ideas of ways to approach different cases, but by no means should you memorise any of the structures Cosentino suggests and try use them in cases.
Victor Cheng is a much better resource, and I would strongly recommend it over Case in Point. It will give you the core skills you need to solve cases. However, it is not enough to just use his resources, and it is also a little outdated nowadays. The only way to develop solid case interviews skills is lots of practice with serious partners (either expert coaches on preplounge or people that have received top tier offers).